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Ethernut 3 Ports

Expansion Port


64-Pin Header, 0.05" (2.54 mm) grid, 2 rows

Important note: While all pins on Ethernut 1 are 5V CMOS compatible, and all pins on Ethernut 2 are at least 5V tolerant, the pins on Ethernut 3 are 3.3V. And they are 5V tolerant only, if they are not connected to the CPU. Applying voltages above 3.3V to any CPU pin may destroy the AT91R40008 chip on Ethernut 3.

The Ethernut Expansion Port had been originally specified for the ATmega128. To maintain some compatibility, the AT91 port pins on the Ethernut 3 expansion port are not sorted in a specific order, but follow the AVR functions. In opposite to the AVR, the AT91 ports don't have internal pull-up resistors.

Pin Ethernut 3 (ARM7TDMI) Ethernut 1/2 (AVR)
1 VCC3 +3V Power Supply Note 1 VCC3 +3V Power Supply
2 VCC3 +3V Power Supply Note 1 VCC3 +3V Power Supply
3 N/C Not Connected VCC5 +5V Power Supply
4 N/C Not Connected VCC5 +5V Power Supply
5 GND Digital Ground GND Digital Ground
6 GND Digital Ground GND Digital Ground
7 GND Digital Ground GND Digital Ground
8 GND Digital Ground GND Digital Ground
Pin Ethernut 3 (ARM7TDMI) Internal Use CPU CPLD Ethernut 1/2 (AVR)
9 NMR Hardware Reset Input Note 2 Reset button 7 MR\ Hardware Reset Input
10 DC Unreg. DC Power Supply Note 3     DC Unregulated DC Power Supply
11 N/C Not Connected     VCC5 +5V Power Supply
12 N/C Not Connected     VCC5 +5V Power Supply
13 NCRD Configurable Read Strobe Panel 57 RD\ External Memory Bus Read Strobe
14 NCWR Configurable Write Strobe Panel 58 WR\ External Memory Bus Write Strobe
Pin Ethernut 3 (ARM7TDMI) Internal Use CPU CPLD Ethernut 1/2 (AVR)
15 CDR0 Configurable Data Bus Bit 0 Panel 59 D0 External Data Bus Bit 0
16 CDR1 Configurable Data Bus Bit 1 Panel 60 D1 External Data Bus Bit 1
17 CDR2 Configurable Data Bus Bit 2 Panel 61 D2 External Data Bus Bit 2
18 CDR3 Configurable Data Bus Bit 3 Panel 64 D3 External Data Bus Bit 3
19 CDR4 Configurable Data Bus Bit 4 Panel 66 D4 External Data Bus Bit 4
20 CDR5 Configurable Data Bus Bit 5 Panel 68 D5 External Data Bus Bit 5
21 CDR6 Configurable Data Bus Bit 6 Panel 69 D6 External Data Bus Bit 6
22 CDR7 Configurable Data Bus Bit 7 Panel 70 D7 External Data Bus Bit 7
Pin Ethernut 3 (ARM7TDMI) Internal Use CPU CPLD Ethernut 1/2 (AVR)
23 CAR0 Configurable Address Bus Bit 0 Panel 71 A0 External Address Bus Bit 0
PA0 GPIO Port A Bit 0
24 CAR1 Configurable Address Bus Bit 1 Panel 74 A1 External Address Bus Bit 1
PA1 GPIO Port A Bit 1
25 CAR2 Configurable Address Bus Bit 2 Panel 75 A2 External Address Bus Bit 2
PA2 GPIO Port A Bit 2
26 CAR3 Configurable Address Bus Bit 3   76 A3 External Address Bus Bit 3
PA3 GPIO Port A Bit 3
27 CAR4 Configurable Address Bus Bit 4   77 A4 External Address Bus Bit 4
PA4 GPIO Port A Bit 4
28 CAR5 Configurable Address Bus Bit 5   78 A5 External Address Bus Bit 5
PA5 GPIO Port A Bit 5
29 CAR6 Configurable Address Bus Bit 6   79 A6 External Address Bus Bit 6
PA6 GPIO Port A Bit 6
30 CAR7 Configurable Address Bus Bit 7   80 A7 External Address Bus Bit 7
PA7 GPIO Port A Bit 7
31 CAR8 Configurable Address Bus Bit 8   81 A8 External Address Bus Bit 8
PC0 GPIO Port C Bit 0
32 CAR9 Configurable Address Bus Bit 9   82 A9 External Address Bus Bit 9
PC1 GPIO Port C Bit 1
33 CAR10 Configurable Address Bus Bit 10   83 A10 External Address Bus Bit 10
PC2 GPIO Port C Bit 2
34 CAR11 Configurable Address Bus Bit 11   85 A11 External Address Bus Bit 11
PC3 GPIO Port C Bit 3
35 CAR12 Configurable Address Bus Bit 12   86 A12 External Address Bus Bit 12
PC4 GPIO Port C Bit 4
36 CAR13 Configurable Address Bus Bit 13   87 A13 External Address Bus Bit 13
PC5 GPIO Port C Bit 5
37 CAR14 Configurable Address Bus Bit 14   88 A14 External Address Bus Bit 14
PC6 GPIO Port C Bit 6
38 CAR15 Configurable Address Bus Bit 15   91 A15 External Address Bus Bit 15
PC7 GPIO Port C Bit 7
Pin Ethernut 3 (ARM7TDMI) Internal Use CPU CPLD Ethernut 1/2 (AVR)
39 P15 GPIO Port Bit 15 Note 4
RXD0 UART 0 Receive Input 		RS2326992 PE0 GPIO Port E Bit 0
RXD0 UART 0 Receive Input
PDI Programming Data Input
40 P14 GPIO Port Bit 14
TXD0 UART 0 Transmit Output 		RS2326893 PE1 GPIO Port E Bit 1
TXD0 UART 0 Transmit Output
PDO Programming Data Output
41 P13 GPIO Port Bit 13
SCK0 USART 0 External Clock 		 6794 PE2 GPIO Port E Bit 2
XCK0 USART 0 External Clock
AIN0 Analog Comparator Positive Input
42 P8 GPIO Port Bit 8
TIOB2 Counter Channel 2 I/O Pin B 		 5995 PE3 GPIO Port E Bit 3
OC3A Counter 3 Compare and PWM A
AIN1 Analog Comparator Positive Input
43 P9 GPIO Port Bit 9 Note 5
IRQ0 External Interrupt Request 1 		CPLD IRQ6096 PE4 GPIO Port E Bit 4
INT4 External Interrupt 4
OC3B Counter 3 Compare and PWM B
44 P27 GPIO Port Bit 27
NCS3 Chip Select 3 Note 6 		 10097 PE5 GPIO Port E Bit 5
INT5 External Interrupt 5
OC3C Counter 3 Compare and PWM C
45 P11 GPIO Port Bit 11
IRQ2 External Interrupt Request 2 		 64  PE6 GPIO Port E Bit 6
INT6 External Interrupt 6
T3 Counter 3 Clock Input
46 P12 GPIO Port Bit 12
FIQ Fast Interrupt Request 		 6698 PE7 GPIO Port E Bit 7
INT7 External Interrupt 7
ICP3 Counter 3 Input Capture
47 P0 GPIO Port Bit 0
TCLK0 External Clock Counter Channel 0 		 49  PB0 GPIO Port B Bit 0
-SS SPI Slave Select Input
48 P1 GPIO Port Bit 1
TIOA0 Counter Channel 0 I/O Pin A 		 50  PB1 GPIO Port B Bit 1
SCK SPI Bus Serial Clock
49 P2 GPIO Port Bit 2
TIOB0 Counter Channel 0 I/O Pin B 		 51  PB2 GPIO Port B Bit 2
MOSI SPI Bus Master Output / Slave Input
50 P3 GPIO Port Bit 3
TCLK1 External Clock Counter Channel 0 		 54100 PB3 GPIO Port B Bit 3
MISO SPI Bus Master Input / Slave Output
51 P4 GPIO Port Bit 4
TIOA1 Counter Channel 1 I/O Pin A 		 55101 PB4 GPIO Port B Bit 4
OC0 Counter 0 Compare and PWM
52 P5 GPIO Port Bit 5
TIOB1 Counter Channel 1 I/O Pin B 		 56102 PB5 GPIO Port B Bit 5
OC1A Counter 1 Compare and PWM A
53 P6 GPIO Port Bit 6
TCLK2 External Clock Counter Channel 0 		 57103 PB6 GPIO Port B Bit 6
OC1B Counter 1 Compare and PWM B
54 P7 GPIO Port Bit 7
TIOA2 Counter Channel 2 I/O Pin A 		 58104 PB7 GPIO Port B Bit 7
OC1C Counter 1 Compare and PWM C
OC2 Counter 2 Compare and PWM
Pin Ethernut 3 (ARM7TDMI) Internal Use CPU CPLD Ethernut 1/2 (AVR)
55 P17 GPIO Port Bit 17 Note 7 I2C SCL71105 PD0 GPIO Port D Bit 0
INT0 External Interrupt 0
SCL TWI Serial Clock
56 P16 GPIO Port Bit 16 Note 7, 8 I2C SDA
XTMS (JP9)		70106 PD1 GPIO Port D Bit 1
INT1 External Interrupt 1
SDA TWI Serial Data
57 P22 GPIO Port Bit 22 Note 4
RXD1 UART 1 Receive Input 		(RS232)76107 PD2 GPIO Port D Bit 2
INT2 External Interrupt 2
RXD1 UART 1 Receive Input
58 P21 GPIO Port Bit 21
TXD1 UART 1 Transmit Output
NTRI Three-State Mode Select 		(RS232)75110 PD3 GPIO Port D Bit 3
INT3 External Interrupt 3
TXD1 UART 1 Transmit Output
59 P23 GPIO Port Bit 23 Note 8 XTDI (JP9)83111 PD4 GPIO Port D Bit 4
ICP1 Counter 1 Input Capture
60 P20 GPIO Port Bit 20
SCK1 USART 1 External Clock 		 74112 PD5 GPIO Port D Bit 5
XCK1 USART 1 External Clock
61 P19 GPIO Port Bit 19 Note 8 XTDO (JP9)73113 PD6 GPIO Port D Bit 6
T1 Counter 1 Clock Input
62 P18 GPIO Port Bit 18 Note 8 XTCK (JP9)72115 PD7 GPIO Port D Bit 7
T2 Counter 2 Clock Input
63 N/C Not Connected Note 9     N/C Not Connected
64 N/C Not Connected Note 9     N/C if R34 not mounted
ALE External Address Bus Latch Enable

Note 1
External expansion boards may draw up to 300 mA from the Ethernut 3.3V supply.

Note 2
Pin 9 can be used to reset Ethernut when connected to an open collector output or an external push button.

Note 3
Pin 10 is connected to the power supply input of the Ethernut board. However, it is not directly connected but routed through the rectifier bridge and protected by a Transil Diode against overvoltage (> 24V) and a 1A fast acting fuse. The rectifier bridge has a very low voltage drop of typically 1V only. Up to 1A may be drawn by the Ethernut board plus expansion hardware.
This pin may also be used to provide power supply for the Ethernut board. In this case keep the voltage between 6 and 24 Volts. The Ethernut Board will draw about 200 mA at 6V, 100 mA at 12V or 50 mA at 24V.

Note 4
Using pin 39 (P15) or pin 57 (P22) as GPIO requires CPLD re-programming.

Note 5
Pin 43 (P9) is used by the CPLD for interrupt request. Using this pin for GPIO requires CPLD re-programming.

Note 6
Using pin 44 for chip select requires a modified memory remapping in the C startup file.

Note 7
Pins 55 (SCL) and 56 (SDA) are used to control the two on-board I2C devices, the programmable PLL clock and the RTC/EEPROM chip. External I2C hardware (3.3V) can be additionally attached to these pins.
Pin 55 (P17) should not be used as GPIO. If I2C is idle (pin 55 always high), then pin 56 (P16) may be used as a limited input pin. Note, that both pins have pull up resistors attached.

Note 8
Pins 56 (P16), 59 (P23), 61 (P19) and 62 (P18) are used as TMS, TDI, TDO and TCK resp. during CPLD programming with the XSVF Executor Utility. Make sure to disconnect them from the CPLD JTAG via JP9, before using them as outputs.

Note 9
Pins 63 and 64 are reserved for custom applications and will be kept unconnected throughout all Ethernut revisions.



Panel Connector

24-Pin Flat Cable Connector, 0.5 mm Pitch

The panel connector can be used to attach a front panel board, containing LCD, keyboard or similar user interfaces. It contains an 8 bit data bus, a 3 bit address bus as well as a read and a write strobe line, which are all shared with the same lines at the expansion bus. In addition there is a dedicated panel chip select line. Last not least a 3.3V power supply is available.

This connector is not available on Ethernut 1 and 2.

Pin Signal CPLD
1 VCC3 +3.3V Power Supply  
2 GND Digital Ground  
3 CDR7 Configurable Data Bus Bit 7 70
4 CDR6 Configurable Data Bus Bit 6 69
5 GND Digital Ground  
6 CDR5 Configurable Data Bus Bit 5 68
7 CDR4 Configurable Data Bus Bit 4 66
8 GND Digital Ground  
9 CDR3 Configurable Data Bus Bit 3 64
10 CDR2 Configurable Data Bus Bit 2 61
11 GND Digital Ground  
12 CDR1 Configurable Data Bus Bit 1 60
13 CDR0 Configurable Data Bus Bit 0 59
14 GND Digital Ground  
15 NCWR Configurable Write Strobe 58
16 NCRD Configurable Read Strobe 57
17 GND Digital Ground  
18 PNCS Configurable Panel Chip Select 56
19 CAR0 Configurable Address Bus Bit 0 71
20 GND Digital Ground  
21 CAR1 Configurable Address Bus Bit 1 74
22 CAR2 Configurable Address Bus Bit 2 75
23 GND Digital Ground  
24 VCC3 +3.3V Power Supply  

Except ground and power supply, all lines at the panel connector are 5V tolerant and re-configurable by replacing the CPLD contents.



MMC Socket

Low Profile SD Card Socket

The MMC Socket can be used for Multimedia and Secure Digital Cards. Currently Nut/OS supports SPI Mode only.

Ethernut 1 and 2 don't provide any card socket. Instead, a 20-pin header at the same board location offers an 8 channel ADC. In turn, Ethernut 3 doesn't provide analog inputs.

Pin Signal SPI Mode 4-Bit SD Mode CPLD
1 MDAT3 Card Select Bidirectional Data Line 3 128
2 MCMD Serial Data Output Line Bidirectional Command/Response Line 126
3 GND Digital Ground
4 VCC3 +3.3V Power Supply
5 MCLK Clock Output 125
6 GND Digital Ground
7 MDAT0 Serial Data Input Line Bidirectional Data Line 0 124
8 MDAT1 Interrupt Line Bidirectional Data Line 1 121
9 MDAT2 Not Used Bidirectional Data Line 2 129
C GND Digital Ground
WP MWP Write Protect Sense 130
CD MCD Card Detect Sense 120


RS232 Connector

9-pin female DB-9 connector.

Ethernut 3 uses a male DB-9 connector with full modem handshake, in opposite to Ethernut 1 and 2, which both provide a female type with no or RTS/CTS flow control only.

Pin Signal CPLD
1 DCD Data Carrier Detect Input 48 CDCD
2 RD Receive Data Input 45 CRD
3 TD Transmit Data Output 41 CTD
4 DTR Data Terminal Ready Output 40 CDTR
5 GND  
6 DSR Data Set Ready Input 46 CDSR
7 RTS Request To Send Output 43 CRTS
8 CTS Clear To Send Input 44 CCTS
9 RI Ring Indicator Input, if R1 mounted (default)DC Power Supply, if R101 mounted 49 CRI


Ethernet Connector

8-pin RJ-45 connector with integrated LEDs and transformer.

Ethernut 3 does not support power supply over Ethernet. Compared to Ethernut 1 and 2, LED colors had been swapped. The green LED signals link and the yellow LED lits on activity.

Pin Signal
1 TX+ Positive Transmit Line
2 TX- Negative Transmit Line
3 RX+ Positive Receive Line
4/5 Connected to shield via 75 Ohm / 10 nF
6 RX- Negative Receive Line
7/8 Connected to shield via 75 Ohm / 10 nF


Power Supply Connector

2.0 mm barrel connector.

Due to the on-board rectifier bridge, polarity doesn't matter.